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let bear = Array("bear")
let bird = Array("bird")
let diff = bird.difference(from: bear)
let newBird = bear.applying(diff)
print(diff)
print(newBird)

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func parsingDates() {
    let date = Date.now

    let format = Date.FormatStyle().year().day().month()
    let formatted = date.formatted(format) //  "Jun 7, 2021"

    if let date = try? Date(formatted, strategy: format) {

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// https://developer.apple.com/videos/play/wwdc2022/110357 

import RegexBuilder

func ~=<T>(pattern :Regex<T> , value:  String) -> Bool {
    do {
        return try pattern.firstMatch(in: value) != nil
    } catch {
        return false
    }

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bundle

#!/usr/bin/env ruby
ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../Gemfile', __FILE__)
load Gem.bin_path('bundler', 'bundle')

rails

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input part

use part

##Methodology to examine routing system.

Playing with Rails console

$ rails c
> app.main_app.routes  

=> #

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ActionController::HttpAuthentication::Basic::ControllerMethods

• authenticate_or_request_with_http_basic(realm = "Application", &login_procedure)
• authenticate_with_http_basic(&login_procedure)
• request_http_basic_authentication(realm = "Application")

ActionController::HttpAuthentication::Digest::ControllerMethods

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• ActionView::TestCase
• ActionController::TestCase
• ActionDispatch::IntegrationTest
• ActiveSupport::TestCase

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rails console

Model

> ActiveRecord::Base.connection.tables.map { |t| "#{t} => " + ActiveRecord::Base.connection.execute("select count(*) from #{t}").fetch_row.first}

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render and redirect_to

To

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form_for @obj, url: {action: 'create', type: @type}

• http://stackoverflow.com/questions/1549055/rails-pass-parameters-with-render-action